I don't agree with all their rankings but I love the layout at drafttek. Their team needs rankings aren't bad. I have corresponded with their Saints guy and he seems pretty sound.
perhaps the best thing there is the positional rankings. Most draft sites just have LBs, DTs, & DEs that you have decipher into 3-4 or 4-3 types. They separate then into-
DE34 DE43 DT34 DT43 OLB34 OLB43 and WILB & SILB
they are ranked by position and relative to their big board too HERE
are 29 3-4OLB prospects